AMD sank more than 3% Tuesday after its third-largest shareholder — Abu Dhabi-based Mubadala Investment Co. — sold 22 million shares at a market value of $427.7 million, according to data compiled by Bloomberg.

The investment firm held 56.9 million shares of AMD as of its most recent filing in August 2017, equating to more than 5% of the chipmaker’s total equity. Only Vanguard and BlackRock have larger stakes.

It’s not clear when Mubadala amassed the large stake in AMD, but the investment likely netted a hefty profit. Shares of the company have risen 37% since last August, when the 57 million share stake was disclosed, easily outpacing the S&P 500’s 14% gain in the same period.

Mubadala did not immediately respond to a request for comment from Business Insider.